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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec608acb66e96f5a7b7a39382cb912279d690fd67a3cf78ed2dae3423bde8e10' 
  AND token = 'jGg5b6XWeAKpxiUg0Rc0S938CLJM14VIixcYcxiIbrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}